Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
SIL-3214
Service Bulletin/Repair Instructions
Altec has learned that the king pin towing capacity placard might not be installed on certain DL derricks built from August 2005 to October 2024. This could lead to unintentional overloading which could result in cracks or deformations to the king pin assembly. Altec has had no reports of this issue occuring. This area should be inspected regularly as outlined in the Welds and Fasteners subsections in Section 4 of the unit’s Maintenance and Parts Manual.
SIL-3143
Service Bulletin/Repair Instructions
Altec has learned that a 12-volt Airtronics relay installed in the PDM could have been manufactured to an insufficient threshold on certain units built from December 2004 to October 2022. This can cause the relay to overheat and fail, causing the accessory lights to stop working.
SIL 795
Service Bulletin/Repair Instructions
Some customers have reported cracks occurring in the stationary frame tubes above the chassis frame rails of some HD35A pressure diggers built from 2005 through 2020. Investigation has shown this to be caused by improper orientation of the spacer blocks welded to the bottom of the stationary frame tubes. Altec requires the stationary frame on each unit to be inspected no later than the next preventive maintenance interval. If the inspection shows that the spacer blocks are oriented incorrectly, the unit must be repaired no later than 30 days after the inspection using the Repair Procedure provided in the notification.
SIL 677
Service Bulletin/Repair Instructions
This service information letter (SIL) notified customers to inspect the electrical slip ring for proper installation. Slip rings found to be improperly installed are to be replaced.
SIL 669
Service Bulletin/Repair Instructions
This service information letter (SIL) notified customers to add a ground wire to the electrical slip ring.